上向 うわむきの互換 ごかん せいじゃなかったです
uwamukino gokanseijanakattadesu

Noun
Desu Copula

The polite, past negative form of 上向きの互換性

1. Wasn't upward compatible.; Didn't have upward compatibility.

Past/Perfective
Negative
Polite
Casual Register